Die-pressing die having dust collection passage at peripheral edge portion of roller unit

ABSTRACT

A die-pressing die used for die-pressing a workpiece includes a die body on whose upper face a die hole is formed and on whose bottom face a discharge hole for discharging dusts of the workpiece is formed, and a roller unit disposed within the die hole and having a roller protruding upward from the upper face of the die body. A collection passage for collecting the dusts is formed at a peripheral edge portion of the die hole. One end of the collection passage is opened at the upper face of the die body, and another end thereof is opened to the discharge hole. The collection passage is configured to suction air due to a negative pressure state in the discharge hole.

TECHNICAL FIELD

The present invention relates to a die-pressing die used when carryingout die-pressing such as beveling or marking (engraving) to a workpiece.

BACKGROUND ART

Recently, various die-pressing dies and die-pressing punches aredeveloped, and there is a Patent Document 1 as a prior art ofdie-pressing dies and die-pressing punches. Here, configurations of adie-pressing die and a die-pressing punch according to a prior art(conventional die-pressing die and die-pressing punch) are explained.

A conventional die-pressing punch includes a hollow cylindrical punchguide, and the punch guide is installed vertically movably (movably in avertical direction) in an installation hole of an upper die holdermember of an upper turret in a punch press. In addition, the punch guideincludes a punch body (punch driver) movable vertically in its inside.Further, the punch body includes, at its upper end portion, aring-shaped punch head integrally therewith, and the punch head is to bepressed (struck) from above by a striker in the punch press.

The punch guide includes an upper roller unit movable vertically beneaththe punch body in its inside, and the upper roller unit includes arotatable upper roller protruding downward from a bottom face of thepunch guide. In addition, the punch guide includes, above the punch bodyin its inside, a spring urging the upper roller unit downward via thepunch body.

The conventional die-pressing die includes a cylindrical die bodyinstalled in a lower die holder member such as a lower turret in thepunch press, and a die hole is formed at a center portion of an upperface of the die body. In addition, the die body includes a lower rollerunit within the die hole, and the lower roller unit has a rotatablelower roller protruding upward with respect to the upper face of the diebody.

Therefore, a workpiece is located between the die-pressing punch and thedie-pressing die by moving it in a horizontal direction. Then, bypressing the punch head from above by the striker to move thedie-pressing punch (punch guide) downward, a worked portion of theworkpiece is nipped by combination motions of the upper roller and thelower roller. Then, the workpiece is moved relatively to thedie-pressing punch and the die-pressing die in the horizontal directionassociating with the worked portion. In the other words, thedie-pressing punch and the die-pressing die are moved relatively to theworkpiece in the horizontal direction along the worked portion of theworkpiece. By this, die-pressing such as beveling can be done to theworkpiece.

PRIOR ART DOCUMENT Patent Document

Patent Document 1: Japanese Patent Application Publication No. H9-52129

Here, dusts such as metal powders may stay at a periphery of the lowerroller on the upper face of the die body. In such a case, there arefollowing problems: a bottom face of the workpiece is scratched by thedusts, and rotation performance of the lower roller is inhibited due toentries of the dusts into the inside of the lower roller unit andthereby life of the lower roller unit is shortened.

SUMMARY OF INVENTION

In order to provide a die-pressing die that can solve the above problemsand is configured by a new configuration, an object of the presentinvention is to provide a die-pressing die that can sufficiently preventa bottom face of a workpiece from being scratched and can restrict dustsfrom entering into an inside of a lower free ball bearing.

MEANS FOR SOLVING PROBLEMS

According to an aspect of the present invention, provided is adie-pressing die used for die-pressing a workpiece, the die-pressing diecomprising: a die body (die main body) on whose upper face a die hole isformed and on whose bottom face a discharge hole for discharging dustsis formed; and a roller unit (lower roller unit) disposed within the diehole and having a rotatable roller (lower roller) protruding upward fromthe upper face of the die body, wherein a collection passage forcollecting the dusts is formed at a peripheral edge portion of the diehole, one end (inlet side) of the collection passage is opened at theupper face of the die body, another end (outlet side) of the collectionpassage is opened to the discharge hole, and the collection passage isconfigured to suction air due to a negative pressure state in thedischarge hole.

It is preferable that a circumferential groove is formed on an outercircumferential surface of the die body, a supply passage for supplyingair into an inside of the die body is formed, one end of the supplypassage is opened to the circumferential groove, another end of thesupply passage is opened to the discharge hole, and an inside of thedischarge hole is configured to be turned into the negative pressurestate when air is supplied to the supply passage.

It is preferable that a depressed storage portion for storing the dustsis formed at the peripheral edge portion of the die hole on the upperface of the die body.

It is preferable that the roller unit is detachable with respect to thedie body.

It is preferable that the collection passage faces to part of an outercircumferential surface of the roller unit from an upper end thereof toa lower end thereof.

It is preferable that the roller is a ball roller, and the roller unitis a free ball bearing.

According to the aspect of the present invention, during die-pressing ofthe workpiece, the collection passage suctions air by turning the insideof the discharge hole into the negative pressure state (depressurizedstate). Then, the dusts such as metal powders attaching to the upperface of the die body are sent to a side of the discharge hole throughthe collection passage and thereby discharged from the discharge hole tothe outside. Therefore, it becomes possible to sufficiently restrict thedusts from staying around the roller unit on the upper face of the diebody during die-pressing of the workpiece.

According to the present invention, it becomes possible to sufficientlyprevent a bottom face of the workpiece from being scratched by the dustsand to prolong life of the roller unit by restricting the dusts fromentering into the inside of the roller unit.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a cross-sectional view showing a die-pressing die set(including its surroundings) according to an embodiment of the presentinvention.

FIG. 2(a) is a schematic perspective view showing a state where bevelingis done with the die-pressing die set according to the embodiment of thepresent invention, and FIG. 2(b) is a state where marking is done withthe die-pressing die set according to the embodiment of the presentinvention.

FIG. 3 is a cross-sectional view showing a die-pressing punch accordingto the embodiment of the present invention.

FIG. 4 is a side view showing the die-pressing punch according to theembodiment of the present invention.

FIG. 5 is a cross-sectional view showing a die-pressing die (includingits surroundings) according to the embodiment of the present invention.

FIG. 6(a) is a plan view showing the die-pressing die according to theembodiment of the present invention, and FIG. 6(b) is a cross-sectionalview showing the die-pressing die according to the embodiment of thepresent invention.

FIG. 7(a) is a perspective view showing the die-pressing die accordingto the embodiment of the present invention, and FIG. 7(b) is a bottomview showing the die-pressing die according to the embodiment of thepresent invention.

FIG. 8(a) is a plan view showing a die-pressing die according to amodified example of the embodiment of the present invention, and FIG.8(b) is a cross-sectional view showing the die-pressing die according tothe modified example of the embodiment of the present invention.

FIG. 9(a) is a schematic cross-sectional view explaining actions withrespect to beveling with the die-pressing die set according to theembodiment of the present invention, and FIG. 9(b) is a schematiccross-sectional view taken along a line IX-IX in FIG. 9(a).

FIG. 10(a) is a schematic cross-sectional view explaining actions withrespect to beveling with the die-pressing die set according to theembodiment of the present invention, and FIG. 10(b) is a schematiccross-sectional view taken along a line X-X in FIG. 10(a).

FIG. 11(a) is a schematic cross-sectional view explaining actions withrespect to marking with the die-pressing die set according to theembodiment of the present invention, and FIG. 11(b) is a schematiccross-sectional view taken along a line XI-XI in FIG. 11(a).

FIG. 12(a) is a schematic cross-sectional view explaining actions withrespect to marking with the die-pressing die set according to theembodiment of the present invention, and FIG. 12(b) is a schematiccross-sectional view taken along a line XII-XII in FIG. 12(a).

FIG. 13 is a cross-sectional view showing a die-pressing die (includingits surroundings) according to another embodiment of the presentinvention.

DESCRIPTION OF EMBODIMENTS

An embodiment and another embodiment according to the present inventionwill be described with reference to the drawings.

Note that, in the Description and the Claims of the present application,“provided” means being provided indirectly with another memberinterposed therebetween in addition to being provided directly, and hasthe same meaning as “included”. “Includes” means including indirectlywith another member interposed therebetween in addition to includingdirectly, and has the same meaning as “provide”. In addition, an “axialcenter” indicates an axial center of a die-pressing punch ordie-pressing die, and, in other words, indicates an axial center of apunch guide, a punch body or a die body.

Embodiment According to the Present Invention

As shown in FIG. 1 and FIGS. 2(a) and (b), a die-pressing die set 1according to an embodiment of the present invention is used for carryingout die-pressing such as beveling and marking on a plate-shapedworkpiece W, and configured of a die-pressing punch 3 and a die-pressingdie 5. In addition, the die-pressing punch 3 is held detachably in aninstallation hole 9 of an upper turret 7, which serves as an upper holdbase in a punch press. The die-pressing die 5 is held detachably in aninstallation hole 15 of a die holder 13 attached to a lower turret 11,which serves as a lower hold base in the punch press.

Next, configurations of the die-pressing punch 3 according to theembodiment of the present invention will be explained.

As shown in FIG. 1, FIG. 3 and FIG. 4, the die-pressing punch 3 includesa hollow cylindrical punch guide 17, and the punch guide 17 is held inthe installation hole 9 of the upper turret 7 vertically movably(movably in a vertical direction) and detachably. The punch guide 17 issupported by plural lifter springs (not shown in the drawings) attachedalong a circumferential edge of the installation hole 9 of the upperturret 7. In addition, the punch guide 17 is configured so as not to berotatable about an axial center C with respect to the installation hole9 of the upper turret 7.

The punch guide 17 includes a vertically movable punch body 19 in itsinside, and the punch body 19 is configured so as not to be rotatableabout the axial center (axial center of the punch guide 17) C. Inaddition, the punch body 19 includes a ring-shaped punch head 21screw-fitted therewith at its upper end portion, and the punch head 21is to be pressed (struck) from above by a striker 23 in the punch press.

The punch guide 17 includes a vertically movable upper free ball bearing25, which serves as an upper roller unit, beneath (on a lower side of)the punch body 19 in its inside. The upper free ball bearing 25 is notremovable from the bunch guide 17. In addition, the upper free ballbearing 25 includes a unit main body 27 provided vertically movably inthe inside of the punch guide 17, and the unit main body 27 has asupport surface 27 f depressed hemispherically at its lower portion.Further, the upper free ball bearing 25 has an upper ball roller (upperroller having a spherical shape) 29 provided rotatably on the supportsurface 27 f of the unit main body 27 via plural small balls (not shownin the drawings). The upper ball roller 29 protrudes downward from abottom face of the punch guide 17.

The punch guide 17 includes a coil spring 31 urging the upper free ballbearing 25 downward, between the punch body 19 and the upper free ballbearing 25 in its inside. In addition, the punch body 19 includes aring-shaped spring seat 33 on an upper side of the punch guide 17 on aside of its outer circumferential surface. Further, the punch body 19includes, between the punch head 21 and the spring seat 33 on a side ofits outer circumferential surface, a stripper spring 35 for keeping adistance, in the vertical direction, between the punch head 21 and thepunch guide 17 at a given distance.

Next, configurations of the die-pressing die 5 according to theembodiment of the present embodiment will be explained.

As shown in FIG. 1 and FIG. 5 to FIG. 7, the die-pressing die 5 includesa cylindrical die body (die main body) 37, and the die body 37 is helddetachably in the installation hole 15 of the die holder 13. Inaddition, a die hole 39 is formed at a center portion of an uppersurface of the die body 37. A discharge hole 41 for discharging dusts Gsuch as iron powders (one type of metal powders) to the outside isformed at a center portion of a bottom face of the die body 37. Thedischarge hole 41 communicates with each of a bottom hole 43 formed on abottom of the installation hole 15 of the die holder 13 and apenetrating hole 45 formed in the lower turret 11. In other words, thedischarge hole 41 communicates with the outside through the bottom hole43 of the die holder 13 and the penetrating hole 45 of the lower turret11. Further, a through hole 47 is formed between the die hole 39 and thedischarge hole 41 in the die body 37.

The die body 37 includes a lower free ball bearing 49, which serves as alower roller unit, within the die hole 39. In addition, the lower freeball bearing 49 has a unit main body 51 provided inside the die hole 39of the die body 37, and the unit main body 51 has a support surface 51 fdepressed hemispherically at its upper portion. Further, the lower freeball bearing 49 has a lower ball roller (lower roller having a sphericalshape) 53 provided rotatably on the support surface 51 f of the unitmain body 51 via plural small balls (not shown in the drawings). Thelower ball roller 53 protrudes upward from an upper face of the die body37.

The lower free ball bearing 49 is detachable with respect to the diebody 37 by an attachment screw 55 and an attachment nut 57. Theattachment screw 55 is inserted through the through hole 47, and a baseend portion (an upper end portion) of the attachment screw 55 isintegrally jointed with the unit main body 51. The attachment nut 57 isfastened to a free end portion (a lower end portion) of the attachmentscrew 55, and is contacted and pressed onto (contacts in a state ofapplying pressure with) a ceiling face 41 f of the discharge hole 41.

Here, the lower free ball bearing 49 smaller-sized than the upper freeball bearing 25 is shown as an example in FIG. 1, but the lower freeball bearing 49 identical-sized to the upper free ball bearing 25 orlarger-sized than the upper free ball bearing 25 may be used. In otherwords, the lower ball roller 53 having a smaller diameter than that ofthe upper ball roller 29 is shown as an example in FIG. 1, but the lowerball roller 53 having an identical diameter to that of the upper ballroller 29 or a larger diameter than that of the upper ball roller 29 maybe used.

As shown in FIG. 1 and FIG. 5 to FIGS. 7(a) and (b), a circumferentialgroove 59 is formed on an outer circumferential surface of the die body37. The circumferential groove 59 communicates with a communicationpassage 61 formed in the die holder 13 when the die body 37 is installedin the installation hole 15 of the die holder 13. In addition, thecircumferential groove 59 is connectable to an air supply source 63 suchas an air compressor or a fan via the communication passage 61.

Plural supply passages 65 for supplying high-pressure air are formed atintervals in a circumferential direction on a side of an outercircumferential surface in the die body 37. Each one end (inlet side) ofthe supply passages 65 is opened to the circumferential groove 59, andeach another end (outlet side) of the supply passages 65 is opened tothe discharge hole 41. Each of the supply passages 65 can becommunicated with the communication passage 61 via the circumferentialgroove 59 when the die body 37 is installed in the installation hole 15of the die holder 13. Then, the inside of the discharge hole 41 isturned into a negative pressure state (depressurized state) when thehigh-pressure air is supplied to the plural supply passages 65 from theair supply source 63 through the communication passage 61 and so on.

A ring-shaped depressed storage portion 67 for temporarily storing dustsG (see FIG. 5) is formed at a peripheral edge portion of the die hole onthe upper face of the die body 37. Note that, instead of forming thering-shaped depressed storage portion 67 at the peripheral edge portionof the die hole on the upper face of the die body 37, plural depressedstorage portions (not shown in the drawings) for temporarily storing thedusts G may be formed at intervals in a circumferential direction.

Plural collection passages 69 for collecting the dusts G are formed atintervals in a circumferential direction at a peripheral edge portion ofthe lower free ball bearing 49 in the die body 37, and each of thecollection passages 69 extends in the vertical direction. Each one end(inlet side) of the collection passages 69 is opened to the depressedstorage portion 67, i.e. opened at the upper face of the die body 37.Each another end (outlet side) of the collection passages 69 is openedto the discharge hole 41. Each of the collection passages 69 faces (isopposite) to part of an outer circumferential surface of the unit mainbody 51 (an outer circumferential surface of the lower free ball bearing49) from its upper end to its lower end. Further, each of the collectionpassages 69 is configured to suction air due to the negative pressurestate (depressurized state) in the discharge hole 41.

Note that, as shown in FIGS. 8(a) and (b), a cross-sectional shape ofthe depressed storage portion 67 may be formed in a tapered manner. Inaddition, each of the collection passages 69 may not face to part of theouter circumferential surface of the unit main body 51 from its upperend to its lower end.

Next, actions of the embodiment according to the present invention willbe explained.

Actions with Respect to Beveling

As shown in FIG. 1, FIG. 2(a) and FIGS. 9(a) and (b), a workpiece W islocated between the die-pressing punch 3 and the die-pressing die 5 bymoving it in the horizontal direction by use of the pie-pressing die set1 in which a diameter of the lower ball roller 53 is made smaller thanthat of the upper ball roller 29. Subsequently, the die-pressing punch 3(the punch guide 17) is moved downward against urging forces of theplural lifter springs by pressing the punch head 21 from above by thestriker 23. Then, an end edge Wa that is a worked portion Wa of theworkpiece W can be nipped by combination motions of the upper ballroller 29 and the lower ball roller 53. At this moment, apex points ofthe upper ball roller 29 and the lower ball roller 53 are slightlyoffset (e.g. 0.5 mm) with respect to the end edge Wa of the workpiece W.

After that, the workpiece W is moved relatively to the die-pressing dieset 1 in the horizontal direction associating with the end edge (workedportion) Wa. In other words, the die-pressing die set 1 is movedrelatively to the workpiece W in the horizontal direction along the endedge Wa of the workpiece W. By this, beveling can be done on abottom-face side of the end edge Wa of the workpiece W.

In a case of carrying out beveling on both-face sides (an upper-faceside and the bottom-face side) of the end edge Wa of the workpiece W,actions equivalent to the above actions are done by use of thedie-pressing die set 1 in which a diameter of the lower ball roller 53is made equal to that of the upper ball roller 29 as shown in FIGS.10(a) and (b).

Actions with Respect to Marking

As shown in FIG. 1, FIG. 2(b) and FIGS. 11(a) and (b), a workpiece W islocated between the die-pressing punch 3 and the die-pressing die 5 bymoving it in the horizontal direction by use of the pie-pressing die set1 in which a diameter of the lower ball roller 53 is made larger thanthat of the upper ball roller 29. Subsequently, the die-pressing punch 3(the punch guide 17) is moved downward against urging forces of theplural lifter springs by pressing the punch head 21 from above by thestriker 23. Then, a worked portion Wa of the workpiece W can be nippedby combination motions of the upper ball roller 29 and the lower ballroller 53.

After that, the workpiece W is moved relatively to the die-pressing dieset 1 in the horizontal direction associating with the worked portionWa. In other words, the die-pressing die set 1 is moved relatively tothe workpiece W in the horizontal direction along the worked portion Waof the workpiece W. By this, marking (engraving) can be done on anupper-face side of the worked portion Wa of the workpiece W.

In a case of carrying out marking on a bottom-face side of the workedportion Wa of the workpiece W, actions equivalent to the above actionsare done by use of a die-pressing die set 1 in which a diameter of thelower ball roller 53 is made smaller than that of the upper ball roller29 as shown in FIGS. 12(a) and (b).

Specific Actions of the Die-Pressing Die 5

During die-pressing such as beveling of the workpiece W, the pluralcollection passages suction air with the negative pressure state in thedischarge hole 41 brought by driving the air supply source 63 to supplyhigh-pressure air to each of the plural supply passages 65 through thecommunication passage 61 and the circumferential groove 59. Then, thedusts G such as iron powders attaching to the upper face of the die body37 are sent to a side of the discharge hole 41 through the pluralcollection passages 69 and thereby discharged from the discharge hole 41to the outside through the bottom hole 43 of the die holder 13 and thepenetrating hole 45 of the lower turret 11. By this, it becomes possibleto sufficiently restrict the dusts G from staying around the lower freeball bearing 49 on the upper face of the die body 37. Especially, sinceeach of the collection passages 69 faces to part of the outercircumferential surface of the unit main body 51 from its upper end toits lower end, collectivity of the dusts G is improved and thereby itbecomes possible to sufficiently restrict the dusts G from stayingaround the lower free ball bearing 49.

On the other hand, dusts G that are not discharged from the dischargehole 41 to the outside are temporarily stored in the depressed storageportion 67. By this, it becomes possible to sufficiently restrict thedusts G from dispersing during die-pressing of the workpiece W.

As explained above, according to the embodiment of the presentinvention, it becomes possible to sufficiently restrict the dusts G fromstaying around the lower free ball bearing 49 on the upper face of thedie body 37 while sufficiently restricting the dusts G from dispersingduring die-pressing of the workpiece W. Therefore, it becomes possibleto sufficiently prevent the bottom face of the workpiece W from beingscratched by the dusts G, and to prolong life of the lower free ballbearing 49 by restricting the dusts G from entering into the inside ofthe lower free ball bearing 49.

In addition, as explained above, the lower free ball bearing 49 isdetachable with respect to the die body 37. Therefore, according to thepresent embodiment, it becomes possible to prolong life of an entire ofthe die-pressing die 5 by replacing the lower free ball bearing 49 in acase where rotation performance of the lower ball roller 53 degrades.

Another Embodiment According to the Present Invention

In another embodiment according to the present invention, a die-pressingdie 71 as shown in FIG. 13 is used, instead of the die-pressing die 5(see FIG. 1), as a configurational element of the die-pressing die set 1(see FIG. 1). Hereinafter, among configurations of the die-pressing die71, only configurations different from those of the die-pressing die 5will be explained. Note that, among configurations of the die-pressingdie 71, configurational elements associating with those of thedie-pressing die 5 are labelled with identical reference numbers thereofin the drawings.

As shown in FIG. 13, the discharge hole 41 is connectable to an airsuction source 75 such as a vacuum pump via a dust collection box 73disposed beneath the lower turret 11 or the like. In other words, theinside of the discharge hole 41 is configured to be turned into anegative pressure state (depressurized state) by driving the air suctionsource 75. Along with this, the circumferential groove 59 (see FIG. 1)and the supply passages 65 (see FIG. 1) are omitted from the die body37.

Therefore, during die-pressing such as beveling of the workpiece W, theplural collection passages suction air by driving the air suction source75 to turn the inside of the discharge hole 41 into the negativepressure state. Then, similar to the specific actions of thedie-pressing die 5, the dusts G such as iron powders attaching to theupper face of the die body 37 are sent to a side of the discharge hole41 through the plural collection passages 69 and thereby discharged fromthe discharge hole 41 to the outside through the bottom hole 43 of thedie holder 13 and the penetrating hole 45 of the lower turret 11. Bythis, it becomes possible to sufficiently restrict the dusts G fromstaying around the lower free ball bearing 49 on the upper face of thedie body 37.

Therefore, also in the other embodiment of the present invention,effects equivalent to those of the embodiment according to the presentinvention can be brought.

Note that the present invention is not limited to the embodiment and theother embodiment explained above, and can be carried out in variousembodiments as explained below.

Instead of the upper free ball bearing 25, another upper roller unit(not shown in the drawings) having an upper roller (not shown in thedrawings) rotatable about a horizontal or vertical rotational axis. Inthis case, instead of the lower free ball bearing 49, another lowerroller unit (not shown in the drawings) having a lower roller (not shownin the drawings) rotatable about a horizontal or vertical rotationalaxis is used.

In addition, a claimed scope contained in the present invention is notlimited to the above-explained embodiments.

1-6. (canceled)
 7. A die-pressing die used for die-pressing a workpiece,the die-pressing die comprising: a die body on whose upper face a diehole is formed and on whose bottom face a discharge hole for dischargingdusts is formed; and a roller unit disposed within the die hole andhaving a rotatable roller protruding upward from the upper face of thedie body, wherein a depressed storage portion for storing the dusts isformed at a peripheral edge portion of the die hole on the upper face ofthe die body, a collection passage for collecting the dusts is formed atthe peripheral edge portion of the die hole, one end of the collectionpassage is opened at the upper face of the die body, another end of thecollection passage is opened to the discharge hole, and the collectionpassage is configured to suction air due to a negative pressure state inthe discharge hole.
 8. A die-pressing die used for die-pressing aworkpiece, the die-pressing die comprising: a die body on whose upperface a die hole is formed and on whose bottom face a discharge hole fordischarging dusts is formed; and a roller unit disposed within the diehole and having a rotatable roller protruding upward from the upper faceof the die body, wherein a collection passage for collecting the dustsis formed at the peripheral edge portion of the die hole, one end of thecollection passage is opened at the upper face of the die body, anotherend of the collection passage is opened to the discharge hole, thecollection passage faces to part of an outer circumferential surface ofthe roller unit from an upper end thereof to a lower end thereof, andthe collection passage is configured to suction air due to a negativepressure state in the discharge hole.
 9. The die-pressing die accordingto claim 7, wherein a circumferential groove is formed on an outercircumferential surface of the die body, a supply passage for supplyingair into an inside of the die body is formed, one end of the supplypassage is opened to the circumferential groove, another end of thesupply passage is opened to the discharge hole, and an inside of thedischarge hole is configured to be turned into the negative pressurestate when air is supplied to the supply passage.
 10. The die-pressingdie according to claim 7, wherein the roller unit is detachable withrespect to the die body.
 11. The die-pressing die according to claim 7,wherein the roller is a ball roller, and the roller unit is a free ballbearing.
 12. The die-pressing die according to claim 8, wherein acircumferential groove is formed on an outer circumferential surface ofthe die body, a supply passage for supplying air into an inside of thedie body is formed, one end of the supply passage is opened to thecircumferential groove, another end of the supply passage is opened tothe discharge hole, and an inside of the discharge hole is configured tobe turned into the negative pressure state when air is supplied to thesupply passage.
 13. The die-pressing die according to claim 8, whereinthe roller unit is detachable with respect to the die body.
 14. Thedie-pressing die according to claim 8, wherein the roller is a ballroller, and the roller unit is a free ball bearing.